Technetium (Tc)
Technetium
Technetium (Tc) is a transition metal in period 5, group 7. Its relative atomic mass is [98] and the molar mass of the atom is [98] g/mol.
Atomic number 43
Atomic mass [98] predicted
Molar mass [98] g/mol
Category Transition metal Solid
Properties of technetium
| Atomic number | 43 |
|---|---|
| Symbol | Tc |
| Latin name | Technetium |
| Relative atomic mass | [98] |
| Molar mass | [98] g/mol |
| Group, period, block | 7, 5, d |
| Category | Transition metal |
| State at 20 °C | Solid |
| Electron configuration | [Kr] 4d⁵ 5s² |
| Electronegativity (Pauling) | 1.9 |
| Atomic radius | 135 pm |
Electron configuration of technetium
Electrons per shell
K2L8M18N13O2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s²
Noble-gas notation
43 protons · 43 electrons[Kr] 4d⁵ 5s²
Formula and compounds of technetium
Simple substanceTctechnetiumMolar mass of Tc: [98] g/mol
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Frequently asked questions
The relative atomic mass of technetium is [98], so the molar mass of the atom is [98] g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s². Noble-gas notation: [Kr] 4d⁵ 5s².